Joined the Service in 1981 Producers: General Dynamics Electric Boat Price: *$2 billion The USS Ohio (SSGN-726) stands as a testament to the U.S. Navy’s innovation and adaptability. Originally commissioned as an SSBN, or ballistic missile submarine, in 1981, the Ohio was converted into a guided-missile submarine (SSGN) between 2002 and 2006. This transformation equipped the vessel with 154 Tomahawk cruise missiles and facilities to support up to 66 special operations personnel.